Package javax.jdo.annotations
Annotation Type Unique
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@Target({TYPE,FIELD,METHOD}) @Retention(RUNTIME) @Repeatable(Uniques.class) public @interface Unique
Annotation for a database unique constraint. Used for database schema generation to create unique constraints. Also used to reorder database operations when flushing changes to avoid unique constraint violations. Corresponds to the xml element "unique".- Since:
- 2.1
- Version:
- 2.1
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Optional Element Summary
Optional Elements Modifier and Type Optional Element Description Column[]
columns
Columns that compose this unique constraint.String
deferred
Whether this unique constraint is deferred until commit.Extension[]
extensions
Vendor extensions.String[]
members
Member (field and property) names that compose this unique constraint.String
name
Name of the unique constraint.String
table
Table for the unique constraint.
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Element Detail
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name
String name
Name of the unique constraint.- Returns:
- the name of the unique constraint
- Default:
- ""
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table
String table
Table for the unique constraint. This is needed iff annotating a type where this unique constraint is not for the primary table for the persistent class or interface.- Returns:
- the table on which the unique constraint is defined
- Default:
- ""
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deferred
String deferred
Whether this unique constraint is deferred until commit.- Returns:
- whether this unique constraint is deferred until commit
- Default:
- ""
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members
String[] members
Member (field and property) names that compose this unique constraint.- Returns:
- member names that compose this unique constraint
- Default:
- {}
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columns
Column[] columns
Columns that compose this unique constraint.- Returns:
- columns that compose this unique constraint
- Default:
- {}
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extensions
Extension[] extensions
Vendor extensions.- Returns:
- the vendor extensions
- Default:
- {}
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